/*
 * Copyright (C) 2010-2011 sunjumper@163.com
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *  http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */
package mf.mfrpc.http;

import java.io.IOException;
import mf.mfrpc.serialize.AdapterDataSource;
import mf.mfrpc.serialize.DataSource;
import mf.mfrpc.serialize.DataSourceIterator;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileUploadException;

/**
 * Http传输的数据流迭代器。
 */
public class HttpDataSourceIterator implements DataSourceIterator {

    private FileItemIterator fit;

    private DataSourceIterator dataSourceIterator;

    public HttpDataSourceIterator(FileItemIterator fit, DataSourceIterator dsit) {
        this.fit = fit;
        this.dataSourceIterator = dsit;
    }

    @Override
    public boolean hasNext() {
        boolean boo = dataSourceIterator.hasNext();
        try {
            if (boo != fit.hasNext())
                throw new IllegalArgumentException();
        } catch (IOException e) {
            throw new HttpException(e);
        } catch (FileUploadException e) {
            throw new HttpException(e);
        }
        return boo;
    }

    @Override
    public DataSource next() {
        AdapterDataSource ds = new AdapterDataSource(dataSourceIterator.next());
        try {
            ds.setInputStream(fit.next().openStream());
        } catch (IOException e) {
            throw new HttpException(e);
        } catch (FileUploadException e) {
            throw new HttpException(e);
        }
        return ds;
    }
}
